APA
Sperber P., . (1983). Fail-safe business negotiating. Englewood Cliffs: Prentice-Hall.
Chicago
Sperber Philip, . 1983. Fail-safe business negotiating. Englewood Cliffs: Prentice-Hall.
Harvard
Sperber P., . (1983). Fail-safe business negotiating. Englewood Cliffs: Prentice-Hall.
MLA
Sperber Philip, . Fail-safe business negotiating. Englewood Cliffs: Prentice-Hall. 1983.